Melons are spaced 1 meter apart in a square x-y grid. one plant is replaced by an irrigation sprayer. the sprayer covers those plants that satisfy the relationship x^2+y^2 < or equal to 20 meters, with the sprayer at (0,0). what are all the possible x coordinates of plants watered by this sprayer? what are all the possible y coordinates of plants watered by this sprayer? list the possible x-coordinates and the possible y-coordinates as separate sets, and sketch this situation. is the relationship of x and y a function? why?